The rules are simple. First, I present The Case, which is a short story. Then I present The Mystery, which are a series of questions you must answer in order to solve the case. Then you ask me yes or no questions, to which I may give one of seven responses: "Yes", "No", "Yes and no", "I don't know", "Irrelevant", "Define what you mean by..." or "Rephrase the question". There are two clues available for each case, but they tend to not be very helpful.

Once you've answered all the questions you have cracked the case! Everybody can play! Here we go.

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Case #1: "Coup de Grass"

The Case:
Harry is found dead on the grass in Southern California. His murderers are never found.

The Mystery:
Who killed Harry?
How did he die?
What became of his murderers?